Surrounded by 14 mayors attending an unprecedented Gracie Mansion gun summit, Mayor Bloomberg charged yesterday that legislators who “vote against getting guns off the street” share responsibility for the death of the 2-year-old boy killed by a stray bullet on Easter Sunday.

“The only thing that would have helped that child is if we had the courage to stand up and get the guns off the street,” Bloomberg declared at a press conference following the four-hour summit.

“And those who vote against getting guns off the street really are the ones as much responsible as the shooter, because if the shooter didn’t have a gun, that child would still be alive.”

Little David Pacheco Jr. was felled by a 9mm bullet that struck his family’s minivan as they headed to Easter services in The Bronx.

The mayor’s statement was his angriest fusillade to date against pro-gun members of Congress who are blocking the city’s attempts to trace guns sales by dealers.

Bloomberg and his counterparts – from as near as Yonkers and as far as Seattle – called the summit the first step in a national campaign to rein in illegal guns, and each signed a six-point statement of principles.

But at least half the principles require state or federal action and, as one expert on gun policy explained, “The federal government is going the other way.”

Trenton Mayor Douglas Palmer suggested that Congress members join him when he has to inform a family about the shooting of a child, as he was forced to do four weeks ago.

“I had to call that mother that night,” Palmer recalled.

“Believe me, it wasn’t pleasant. Maybe some of the people in Congress that are so far removed from this issue and listen to all the lobbying groups need to come with mayors as we make calls with those families.”

But none went as far as Bloomberg.

“The number of people in Washington who are deliberately voting to permit guns to go to the hands of criminals is really worrisome,” Bloomberg said.

Everyone involved pronounced the summit a success, if only because there was agreement to share data, set up a Web site on illegal guns that all the participating cities could access, and schedule a larger summit later this year.

“Someone asked earlier: This is a national problem. How can you 15 mayors do something about it?” noted Yonkers Mayor Phil Amicone. “We can’t. But 150 mayors can.”